A theoretical model of H-mode transition triggered by condensed neutrals near X-point
A theoretical model of H-mode transition triggered by condensed neutrals near X-point
复制标题
X点附近凝聚中性子触发H模跃迁的理论模型
DOI：
10.1088/0741-3335/39/2/007
复制
发表时间：
1997
影响因子：
2.2
通讯作者：
Y. Miura
中科院分区：
文献类型：
--
作者：
S. Toda;S. Itoh;M. Yagi;Y. Miura
本文研究了托卡马克X点附近中性粒子对L/H跃迁的影响。高温等离子体中双极损耗的四种机制，即损耗锥损耗、体粘滞损耗、离子与中性粒子之间的电荷交换（CX）损耗和反常损耗同时发生。发现X点附近的中性粒子触发H模跃迁。它们通过碰撞导致额外的离子损失锥损失。的下限附近的中性密度的X-点的H-模式转变的发病估计。在主等离子体的中性粒子示出，以防止H-模式转换，因为CX损失。
The effects of neutrals near the X-point of tokamaks on the L/H transition are examined. Four mechanisms for bipolar losses, i.e. the loss cone loss, the bulk viscosity loss, the charge-exchange (CX) loss between ions and neutrals and the anomalous loss, occur simultaneously in high-temperature plasmas. Neutral particles near the X-point are found to trigger the H-mode transition. They cause an additional ion loss cone loss via collisions. The lower limit of the neutral density near the X-point for the onset of the H-mode transition is estimated. Neutral particles at the main plasma are shown to prevent the H-mode transition because of CX loss.